. Current herpetology. Reptiles; Herpetology. OSAWA & KATSUNO—DISPERSAL OF FROGS and November. The forest was walked through in the daytime. The average duration of the walks was hours/day until September and at the end of October and hours/day at the end of November. Results Although the survey was conducted 16 times in total, no brown frogs were captured at the end of November. From July to September and at the end of October, 240 yearlings of R. japonica and 154 yearlings of R. ornativen- tris were captured. In addition, 52 adults of R. japonica and 32 adults of R. ornativentris
. Current herpetology. Reptiles; Herpetology. OSAWA & KATSUNO—DISPERSAL OF FROGS and November. The forest was walked through in the daytime. The average duration of the walks was hours/day until September and at the end of October and hours/day at the end of November. Results Although the survey was conducted 16 times in total, no brown frogs were captured at the end of November. From July to September and at the end of October, 240 yearlings of R. japonica and 154 yearlings of R. ornativen- tris were captured. In addition, 52 adults of R. japonica and 32 adults of R. ornativentris were captured. In this survey, we use "adults" to mean large individuals other than yearlings, so they may perhaps have included juveniles two years old. The data analysis does not include individuals that jumped out of the under- growth but could not be captured. The percent- ages of individuals with some limbs or fmgers already missing at the first capture were about 4% for yearlings and adults of R. japonica and about 5% for yearlings of R. ornativentris (0% for adults). Therefore, the misreading of indi- vidual markings at recapture seems low. The growth of yearlings First, to understand the growth of year- lings. Fig. 1 shows the SVL data of individu- als obtained by the survey. As shown in the Figure, both species showed almost linear increases from the beginning of July until the end of October. However, the inclinations of both regression lines show slow curves on and after September. In this period (July to Octo- ber), both increases are statistically significant (Reason's correlation coefficient test, p<). After 9 September, some yearling individuals of both species had nuptial pads on their thumbs, a secondary male sexual character. In summer especially, the SVL increased at an almost constant rate as the season pro- gressed. We calculated the inclinations of the regression as representing straight lines. The average daily growths (SVL) of both s
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